package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 对前端传过来的明文密码进行md5加密，然后再进行比对（已完成）
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     * @return
     */
    public void save(EmployeeDTO employeeDTO){
        Employee employee = new Employee();

        //将前端穿过来的DTO对象属性拷贝到employee实体
        BeanUtils.copyProperties(employeeDTO,employee);

        //通过枚举常量设置账号状态，1表示正常，0表示锁定
        employee.setStatus(StatusConstant.ENABLE);

        //设置默认密码,要注意数据库的密码都是经过md5加密，故这里也要进行md5加密处理,zai
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置当前记录的创建时间和修改时间
/*        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());*/

        //通过ThreadLocal记录当前操作用户的ID，并设置当前纪录创建人Id和修改人Id（jwt拦截器可以解析出当前请求的用户ID，ID可以存到ThreadLocal）
        //PS：因为每一次请求Tomcat都会创建一个线程，每个线程都有一个ThreadLocal（独立的线程空间）用于存储线程的局部变量，ThreadLocal具有隔离性
        //BaseContext类是对ThreadLocal的一个封装,将用户ID：empId 存到ThreadLocal
/*        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId()); */

        //通过持久层插入记录到数据库
        employeeMapper.insert(employee);

    }


    /**
     * 员工分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO){
        //开始分页
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);

        long total = page.getTotal();  //总记录数
        List<Employee> records = page.getResult();
        return new PageResult(total,records);
    }

    /**
     * 启用OR禁用账号
     * @param status
     * @return id
     */

    public void startORstop(Integer status,Long id){  //相关sql：update employee set status = ? where id =?
       /* 方法一：
        Employee employee = new Employee();
        employee.setId(id);
        employee.setStatus(status);*/

        //方法二： 工厂模式？建造者模式？
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();

        employeeMapper.update(employee);

    }

    /**
     * 根据id查询员工信息
     * @param id
     * @return
     */
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        employee.setPassword("*****");   //传给前端的密码用*加密
        return employee;
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     * @return
     */
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee); //将employeeDTO的属性值拷贝到employee

        //将当前threadLocal中的用户id取出并设置给employee (threadLocal中的用户id是被jwt拦截到)
/*        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());  */

        employeeMapper.update(employee);
    }
}
